For easern Canada ( NS. NB. PEI. and Newfoundland ) There are a couple
of sites. You might check out Atlantic Kayak Association out of New
Brunswick or www.kayakers.nf.ca in Newfoundland. The Newfoundland web
site has some great trip reports and some superb photos. The AKA site
has some nice stuff too.
If your discription of Eastern Canada includes Ontario and Quebec the
Barry Canoe Club likely has a good site, I know they have some great
paddlers.
Hope this helps.
Alex